One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,10)(8,9)(11,12)(13,14,18,15)(16,22,25,20)(17,21,19,23)(24,27,28,26)(6,9)(10,12)(13,15,18,14)(16,24,25,28)(17,21,19,23)(20,26,22,27)(1,2,3,4)(13,16,18,25)(14,20,15,22)(17,26,19,27)(21,28,23,24)(5,7,8,11)(6,10,9,12)(13,17)(14,21)(15,23)(16,25)(18,19)(20,22)(13,16,18,25)(14,22,15,20)(17,26,19,27)(21,24,23,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.